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Forum: Probability 01-06-2007, 11:40 AM
Replies: 6
Views: 60
Posted By PairTheBoard
Re: need a probability formula

[ QUOTE ]
For the probability you have at least 1 red marble it is best that you take the complement for when you select no red marbles .

P(r=0) = c(x-y,z)/c(x,z)
p(r=1)+p(r=2)+...+P(r=y)=...
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